LM2931 데이터 시트보기 (PDF) - Motorola => Freescale
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LM2931 Datasheet PDF : 16 Pages
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LM2931 Series
Figure 17. Fixed Output Regulator
Vin
Cin
0.1
Input LM2931–5.0 Output
Fixed
Output
IB Gnd
Vout
CO
Figure 18. Adjustable Output Regulator
Input
Output
Vin
51 k
LM2931C
Output Adjustable
R1
Cin
2 Inhibit
Output Adjust
0.1
1
IAdj
IB Gnd
R2
Vout
CO
+ ǒ ) Ǔ ) w ) Switch Position 1 = Output “On”, 2 = Output “Off”
Vout
Vref 1
R2
R1
IAdj R2
22.5 k
R1 R2
R1 R2
Figure 19. (5.0 A) Low Differential
Voltage Regulator
Input
≥ 6.0 V
D45VH7
68 R
+
100
LM2931–5.0
5.0 V @ 5.0 A
+ Output
100
Figure 20. Current Boost Regulator with
Short Circuit Projection
RSC
Input
R
LM2931–5.0
Output
+
100
+
100
The LM2931 series can be current boosted with a PNP transistor. The
D45VH7, on a heatsink, will provide an output current of 5.0 A with an input
to output voltage differential of approximately 1.0 V. Resistor R in
conjunction with the VBE of the PNP determines when the pass transistor
begins conducting. This circuit is not short circuit proof.
The circuit of Figure 19 can be modified to provide supply protection against
short circuits by adding the current sense resistor RSC and an additional PNP
transistor. The current sensing PNP must be capable of handling the short
circuit current of the LM2931. Safe operating area of both transistors must be
considered under worst case conditions.
Figure 21. Constant Intensity Lamp Flasher
Input
6.4 V to 30 V
+
100
LM2931C 2.0 k
8.2 k
+
100
CM
#345
33 k
6.2 V
0
fosc = 2.2 Hz
Figure 22. Output Noise Voltage versus
Output Capacitor Impedance
100
Vin = 5.6 V
Vout = 5.0 V
IO = 100 mA
10 Vnrms 10 Hz to 10 MHz
|ZO| @ 40 kHz
TA = 25°C
1.0
Unstable
Marginally
Stable
0.1
Stable
0.01
10
100
1.0 k
10 k
|ZO|, MAGNITUDE OF CAPACITOR IMPEDANCE (mΩ)
8
MOTOROLA ANALOG IC DEVICE DATA
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